NEC PD17062 Instrukcja Użytkownika Pobierz pdf (Strona 57)

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PD17062

8.5 INDEX REGISTER (IX) AND DATA MEMORY ROW ADDRESS POINTER (MP)

8.5.1 Configuration of Index Register and Data Memory Row Address Pointer

As shown in Fig. 8-1, the index register consists of 11 bits, including the three low-order bits, of 7AH (IXH)

of the system register, 7BH, and 7CH (IXM, IXL). The index register is used to indirectly specify a data memory

address.

The data memory row address pointer consists of 7 bits, including the three low-order bits of 7AH (MPH)

and 7BH (MPL).

This means that the seven high-order bits of the index register and data memory row address pointer are

shared.

The four high-order bits of the index register, i.e., the four high-order bits of the data memory row address

pointer (7AH b

2-b0, 7BH b3), of

PD17062 are fixed at 0.

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 295 296

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NEC PD17062 Instrukcja Użytkownika Strona 57

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